There are a couple issues with Thunderbird 38.2.0 when starting up from a long sleep or hibernate (especially overnight). First is Bug 1196662 Thunderbird not checking for mails and becomes unresponsive after hibernation (problem is caused by upgrade to Thunderbird 38.2.0). While I have not experienced issues Thunderbird becoming unresponsive I have noticed I need to click the ‘Get Messages Button’ in order to ‘kick-start’ Thunderbird to periodically and automatically check for new messages. Second which appears to be related to the first and affects those who are using Lighting: Bug 1199994 Today pane date incorrect after overnight hibernate [TypeError: this.mDeferred is null]. I have…